/*************************************************************************/
/*  os_x11.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "servers/visual/visual_server_raster.h"
#include "drivers/gles3/rasterizer_gles3.h"
#include "os_x11.h"
#include "key_mapping_x11.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "print_string.h"
#include "servers/physics/physics_server_sw.h"
#include "errno.h"

#include "X11/Xutil.h"

#include "X11/Xatom.h"
#include "X11/extensions/Xinerama.h"
// ICCCM
#define WM_NormalState		1L	// window normal state
#define WM_IconicState		3L	// window minimized
// EWMH
#define _NET_WM_STATE_REMOVE	0L	// remove/unset property
#define _NET_WM_STATE_ADD	1L	// add/set property
#define _NET_WM_STATE_TOGGLE	2L	// toggle property

#include "main/main.h"



#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <dlfcn.h>

//stupid linux.h
#ifdef KEY_TAB
#undef KEY_TAB
#endif


#include <X11/Xatom.h>

#undef CursorShape

int OS_X11::get_video_driver_count() const {
	return 1;
}

const char * OS_X11::get_video_driver_name(int p_driver) const {
	return "GLES3";
}

OS::VideoMode OS_X11::get_default_video_mode() const {
	return OS::VideoMode(1024,600,false);
}

int OS_X11::get_audio_driver_count() const {
    return AudioDriverManagerSW::get_driver_count();
}

const char *OS_X11::get_audio_driver_name(int p_driver) const {

    AudioDriverSW* driver = AudioDriverManagerSW::get_driver(p_driver);
    ERR_FAIL_COND_V( !driver, "" );
    return AudioDriverManagerSW::get_driver(p_driver)->get_name();
}

void OS_X11::initialize(const VideoMode& p_desired,int p_video_driver,int p_audio_driver) {

	last_button_state=0;

	xmbstring=NULL;
	event_id=0;
	x11_window=0;
	last_click_ms=0;
	args=OS::get_singleton()->get_cmdline_args();
	current_videomode=p_desired;
	main_loop=NULL;
	last_timestamp=0;
	last_mouse_pos_valid=false;
	last_keyrelease_time=0;
	xdnd_version = 0;

	if (get_render_thread_mode()==RENDER_SEPARATE_THREAD) {
		XInitThreads();
	}

	/** XLIB INITIALIZATION **/
	x11_display = XOpenDisplay(NULL);

	char * modifiers = XSetLocaleModifiers ("@im=none");
	if (modifiers==NULL) {
		WARN_PRINT("Error setting locale modifiers");
	}

	const char* err;
	xrr_get_monitors = NULL;
	xrr_free_monitors = NULL;
	int xrandr_major = 0;
	int xrandr_minor = 0;
	int event_base, error_base;
	xrandr_ext_ok = XRRQueryExtension(x11_display,&event_base, &error_base);
	xrandr_handle = dlopen("libXrandr.so.2", RTLD_LAZY);
	if (!xrandr_handle) {
		err = dlerror();
		fprintf(stderr, "could not load libXrandr.so.2, Error: %s\n", err);
	}
	else {
		XRRQueryVersion(x11_display, &xrandr_major, &xrandr_minor);
		if (((xrandr_major << 8) | xrandr_minor) >= 0x0105) {
			xrr_get_monitors = (xrr_get_monitors_t) dlsym(xrandr_handle, "XRRGetMonitors");
			if (!xrr_get_monitors) {
				err = dlerror();
				fprintf(stderr, "could not find symbol XRRGetMonitors\nError: %s\n", err);
			}
			else {
				xrr_free_monitors = (xrr_free_monitors_t) dlsym(xrandr_handle, "XRRFreeMonitors");
				if (!xrr_free_monitors) {
					err = dlerror();
					fprintf(stderr, "could not find XRRFreeMonitors\nError: %s\n", err);
					xrr_get_monitors = NULL;
				}
			}
		}
	}

	xim = XOpenIM (x11_display, NULL, NULL, NULL);


	if (xim == NULL) {
		WARN_PRINT("XOpenIM failed");
		xim_style=0L;
	} else {
		::XIMStyles *xim_styles=NULL;
		xim_style=0L;
		char *imvalret=NULL;
		imvalret = XGetIMValues(xim, XNQueryInputStyle, &xim_styles, NULL);
		if (imvalret != NULL || xim_styles == NULL) {
			fprintf (stderr, "Input method doesn't support any styles\n");
		}

		if (xim_styles) {
			xim_style = 0L;
			for (int i=0;i<xim_styles->count_styles;i++) {

				if (xim_styles->supported_styles[i] ==
				    (XIMPreeditNothing | XIMStatusNothing)) {

					    xim_style = xim_styles->supported_styles[i];
					    break;
				    }
			}

			XFree (xim_styles);
		}
		XFree( imvalret );
	}

	/*
	char* windowid = getenv("GODOT_WINDOWID");
	if (windowid) {

		//freopen("/home/punto/stdout", "w", stdout);
		//reopen("/home/punto/stderr", "w", stderr);
		x11_window = atol(windowid);

		XWindowAttributes xwa;
		XGetWindowAttributes(x11_display,x11_window,&xwa);

		current_videomode.width = xwa.width;
		current_videomode.height = xwa.height;
	};
	*/

	// maybe contextgl wants to be in charge of creating the window
	//print_line("def videomode "+itos(current_videomode.width)+","+itos(current_videomode.height));
#if defined(OPENGL_ENABLED) || defined(LEGACYGL_ENABLED)


	context_gl = memnew( ContextGL_X11( x11_display, x11_window,current_videomode, true ) );
	context_gl->initialize();

	RasterizerGLES3::register_config();

	RasterizerGLES3::make_current();

#endif
	visual_server = memnew( VisualServerRaster );
#if 0
	if (get_render_thread_mode()!=RENDER_THREAD_UNSAFE) {

		visual_server =memnew(VisualServerWrapMT(visual_server,get_render_thread_mode()==RENDER_SEPARATE_THREAD));
	}
#endif
	// borderless fullscreen window mode
	if (current_videomode.fullscreen) {
	// needed for lxde/openbox, possibly others
		Hints hints;
		Atom property;
		hints.flags = 2;
		hints.decorations = 0;
		property = XInternAtom(x11_display, "_MOTIF_WM_HINTS", True);
		XChangeProperty(x11_display, x11_window, property, property, 32, PropModeReplace, (unsigned char *)&hints, 5);
		XMapRaised(x11_display, x11_window);
		XWindowAttributes xwa;
		XGetWindowAttributes(x11_display, DefaultRootWindow(x11_display), &xwa);
		XMoveResizeWindow(x11_display, x11_window, 0, 0, xwa.width, xwa.height);

		// code for netwm-compliants
		XEvent xev;
		Atom wm_state = XInternAtom(x11_display, "_NET_WM_STATE", False);
		Atom fullscreen = XInternAtom(x11_display, "_NET_WM_STATE_FULLSCREEN", False);

		memset(&xev, 0, sizeof(xev));
		xev.type = ClientMessage;
		xev.xclient.window = x11_window;
		xev.xclient.message_type = wm_state;
		xev.xclient.format = 32;
		xev.xclient.data.l[0] = 1;
		xev.xclient.data.l[1] = fullscreen;
		xev.xclient.data.l[2] = 0;

		XSendEvent(x11_display, DefaultRootWindow(x11_display), False, SubstructureNotifyMask, &xev);
	}

	// disable resizable window
	if (!current_videomode.resizable) {
		XSizeHints *xsh;
		xsh = XAllocSizeHints();
		xsh->flags = PMinSize | PMaxSize;
		XWindowAttributes xwa;
		if (current_videomode.fullscreen) {
			XGetWindowAttributes(x11_display,DefaultRootWindow(x11_display),&xwa);
		} else {
			XGetWindowAttributes(x11_display,x11_window,&xwa);
		}
		xsh->min_width = xwa.width;
		xsh->max_width = xwa.width;
		xsh->min_height = xwa.height;
		xsh->max_height = xwa.height;
		XSetWMNormalHints(x11_display, x11_window, xsh);
		XFree(xsh);
	}

	AudioDriverManagerSW::get_driver(p_audio_driver)->set_singleton();

	audio_driver_index=p_audio_driver;
	if (AudioDriverManagerSW::get_driver(p_audio_driver)->init()!=OK) {

		bool success=false;
		audio_driver_index=-1;
		for(int i=0;i<AudioDriverManagerSW::get_driver_count();i++) {
			if (i==p_audio_driver)
				continue;
			AudioDriverManagerSW::get_driver(i)->set_singleton();
			if (AudioDriverManagerSW::get_driver(i)->init()==OK) {
				success=true;
				print_line("Audio Driver Failed: "+String(AudioDriverManagerSW::get_driver(p_audio_driver)->get_name()));
				print_line("Using alternate audio driver: "+String(AudioDriverManagerSW::get_driver(i)->get_name()));
				audio_driver_index=i;
				break;
			}
		}
		if (!success) {
			ERR_PRINT("Initializing audio failed.");
		}

	}

	sample_manager = memnew( SampleManagerMallocSW );
	audio_server = memnew( AudioServerSW(sample_manager) );
	audio_server->init();
	spatial_sound_server = memnew( SpatialSoundServerSW );
	spatial_sound_server->init();
	spatial_sound_2d_server = memnew( SpatialSound2DServerSW );
	spatial_sound_2d_server->init();


	ERR_FAIL_COND(!visual_server);
	ERR_FAIL_COND(x11_window==0);

	XSetWindowAttributes new_attr;

	new_attr.event_mask=KeyPressMask | KeyReleaseMask | ButtonPressMask |
			   ButtonReleaseMask | EnterWindowMask |
			   LeaveWindowMask | PointerMotionMask |
			   Button1MotionMask |
			   Button2MotionMask | Button3MotionMask |
			   Button4MotionMask | Button5MotionMask |
			   ButtonMotionMask | KeymapStateMask |
			   ExposureMask | VisibilityChangeMask |
			   StructureNotifyMask |
			   SubstructureNotifyMask | SubstructureRedirectMask |
			   FocusChangeMask | PropertyChangeMask |
			   ColormapChangeMask | OwnerGrabButtonMask;

	XChangeWindowAttributes(x11_display, x11_window,CWEventMask,&new_attr);

	XClassHint* classHint;

	/* set the titlebar name */
	XStoreName(x11_display, x11_window, "Godot");

	/* set the name and class hints for the window manager to use */
	classHint = XAllocClassHint();
	if (classHint) {
		classHint->res_name = (char *)"Godot_Engine";
		classHint->res_class = (char *)"Godot";
	}
	XSetClassHint(x11_display, x11_window, classHint);
	XFree(classHint);

	wm_delete = XInternAtom(x11_display, "WM_DELETE_WINDOW", true);
	XSetWMProtocols(x11_display, x11_window, &wm_delete, 1);


	if (xim && xim_style) {

		xic = XCreateIC (xim,XNInputStyle, xim_style,XNClientWindow,x11_window,XNFocusWindow, x11_window, (char*)NULL);
	} else {

		xic=NULL;
		WARN_PRINT("XCreateIC couldn't create xic");

	}

	XcursorSetTheme(x11_display,"default");
	cursor_size = XcursorGetDefaultSize(x11_display);
	cursor_theme = XcursorGetTheme(x11_display);

	if (!cursor_theme) {
		print_line("not found theme");
		cursor_theme="default";
	}

	for(int i=0;i<CURSOR_MAX;i++) {

		cursors[i]=None;
		img[i]=NULL;
	}

	current_cursor=CURSOR_ARROW;

	if (cursor_theme) {
		//print_line("cursor theme: "+String(cursor_theme));
		for(int i=0;i<CURSOR_MAX;i++) {

			static const char *cursor_file[]={
				"left_ptr",
				"xterm",
				"hand2",
				"cross",
				"watch",
				"left_ptr_watch",
				"fleur",
				"hand1",
				"X_cursor",
				"sb_v_double_arrow",
				"sb_h_double_arrow",
				"size_bdiag",
				"size_fdiag",
				"hand1",
				"sb_v_double_arrow",
				"sb_h_double_arrow",
				"question_arrow"
			};

			img[i] = XcursorLibraryLoadImage(cursor_file[i],cursor_theme,cursor_size);
			if (img[i]) {
				cursors[i]=XcursorImageLoadCursor(x11_display,img[i]);
				//print_line("found cursor: "+String(cursor_file[i])+" id "+itos(cursors[i]));
			} else {
				if (OS::is_stdout_verbose())
					print_line("failed cursor: "+String(cursor_file[i]));
			}
		}
	}


	{
		Pixmap cursormask;
		 XGCValues xgc;
		 GC gc;
		 XColor col;
		 Cursor cursor;

		cursormask = XCreatePixmap(x11_display, RootWindow(x11_display,DefaultScreen(x11_display)), 1, 1, 1);
		xgc.function = GXclear;
		gc = XCreateGC(x11_display, cursormask, GCFunction, &xgc);
		XFillRectangle(x11_display, cursormask, gc, 0, 0, 1, 1);
		col.pixel = 0;
		col.red = 0;
		col.flags = 4;
		cursor = XCreatePixmapCursor(x11_display,
			      cursormask, cursormask,
			      &col, &col, 0, 0);
		 XFreePixmap(x11_display, cursormask);
		 XFreeGC(x11_display, gc);


		 if (cursor == None)
		 {
			 ERR_PRINT("FAILED CREATING CURSOR");
		 }

		 null_cursor=cursor;
	}
	set_cursor_shape(CURSOR_BUSY);

	//Set Xdnd (drag & drop) support
	Atom XdndAware = XInternAtom(x11_display, "XdndAware", False);
	Atom version=5;
	XChangeProperty(x11_display, x11_window, XdndAware, XA_ATOM, 32, PropModeReplace, (unsigned char*)&version, 1);

	xdnd_enter = XInternAtom(x11_display, "XdndEnter", False);
	xdnd_position = XInternAtom(x11_display, "XdndPosition", False);
	xdnd_status = XInternAtom(x11_display, "XdndStatus", False);
	xdnd_action_copy = XInternAtom(x11_display, "XdndActionCopy", False);
	xdnd_drop = XInternAtom(x11_display, "XdndDrop", False);
	xdnd_finished = XInternAtom(x11_display, "XdndFinished", False);
	xdnd_selection = XInternAtom(x11_display, "XdndSelection", False);
	requested = None;

	visual_server->init();
	//
	physics_server = memnew( PhysicsServerSW );
	physics_server->init();
	//physics_2d_server = memnew( Physics2DServerSW );
	physics_2d_server = Physics2DServerWrapMT::init_server<Physics2DServerSW>();
	physics_2d_server->init();

	input = memnew( InputDefault );
#ifdef JOYDEV_ENABLED
	joypad = memnew( JoypadLinux(input));
#endif
	_ensure_data_dir();
}

void OS_X11::finalize() {

	if(main_loop)
		memdelete(main_loop);
	main_loop=NULL;

	spatial_sound_server->finish();
	memdelete(spatial_sound_server);
	spatial_sound_2d_server->finish();
	memdelete(spatial_sound_2d_server);

	//if (debugger_connection_console) {
//		memdelete(debugger_connection_console);
//}

#ifdef JOYDEV_ENABLED
	memdelete(joypad);
#endif
	memdelete(input);

	memdelete(sample_manager);

	audio_server->finish();
	memdelete(audio_server);

	visual_server->finish();
	memdelete(visual_server);
	//memdelete(rasterizer);

	physics_server->finish();
	memdelete(physics_server);

	physics_2d_server->finish();
	memdelete(physics_2d_server);

	if (xrandr_handle)
		dlclose(xrandr_handle);

	XUnmapWindow( x11_display, x11_window );
	XDestroyWindow( x11_display, x11_window );

#if defined(OPENGL_ENABLED) || defined(LEGACYGL_ENABLED)
	memdelete(context_gl);
#endif
	for(int i=0;i<CURSOR_MAX;i++) {
		if( cursors[i] != None )
			XFreeCursor( x11_display, cursors[i] );
		if( img[i] != NULL )
			XcursorImageDestroy( img[i] );
	};

	XDestroyIC( xic );
	XCloseIM( xim );

	XCloseDisplay(x11_display);
	if (xmbstring)
		memfree(xmbstring);


	args.clear();
}


void OS_X11::set_mouse_mode(MouseMode p_mode) {

	if (p_mode==mouse_mode)
		return;

	if (mouse_mode==MOUSE_MODE_CAPTURED)
		XUngrabPointer(x11_display, CurrentTime);
	if (mouse_mode!=MOUSE_MODE_VISIBLE && p_mode==MOUSE_MODE_VISIBLE)
		XUndefineCursor(x11_display,x11_window);
	if (p_mode!=MOUSE_MODE_VISIBLE && mouse_mode==MOUSE_MODE_VISIBLE) {
		XDefineCursor(x11_display,x11_window,null_cursor);
	}

	mouse_mode=p_mode;

	if (mouse_mode==MOUSE_MODE_CAPTURED) {

		while(true) {
			//flush pending motion events

			if (XPending(x11_display) > 0) {
				XEvent event;
				XPeekEvent(x11_display, &event);
				if (event.type==MotionNotify) {
					XNextEvent(x11_display,&event);
				} else {
					break;
				}
			} else {
				break;
			}
		}

		if (XGrabPointer(x11_display, x11_window, True,
				    ButtonPressMask | ButtonReleaseMask |
				    PointerMotionMask, GrabModeAsync, GrabModeAsync,
				    x11_window, None, CurrentTime) !=
				GrabSuccess)  {
			ERR_PRINT("NO GRAB");
		}

		center.x = current_videomode.width/2;
		center.y = current_videomode.height/2;
		XWarpPointer(x11_display, None, x11_window,
			      0,0,0,0, (int)center.x, (int)center.y);

		input->set_mouse_pos(center);
	} else {
		do_mouse_warp=false;
	}

	XFlush(x11_display);
}

void OS_X11::warp_mouse_pos(const Point2& p_to) {

	if (mouse_mode==MOUSE_MODE_CAPTURED) {

		last_mouse_pos=p_to;
	} else {

		/*XWindowAttributes xwa;
		XGetWindowAttributes(x11_display, x11_window, &xwa);
		printf("%d %d\n", xwa.x, xwa.y); needed? */

		XWarpPointer(x11_display, None, x11_window,
			      0,0,0,0, (int)p_to.x , (int)p_to.y);
	}

}

OS::MouseMode OS_X11::get_mouse_mode() const {
	return mouse_mode;
}

int OS_X11::get_mouse_button_state() const {
	return last_button_state;
}

Point2 OS_X11::get_mouse_pos() const {
	return last_mouse_pos;
}

void OS_X11::set_window_title(const String& p_title) {
	XStoreName(x11_display,x11_window,p_title.utf8().get_data());

	Atom _net_wm_name = XInternAtom(x11_display, "_NET_WM_NAME", false);
	Atom utf8_string = XInternAtom(x11_display, "UTF8_STRING", false);
	XChangeProperty( x11_display, x11_window, _net_wm_name, utf8_string, 8, PropModeReplace, (unsigned char*) p_title.utf8().get_data(), p_title.utf8().length());
}

void OS_X11::set_video_mode(const VideoMode& p_video_mode,int p_screen) {
}

OS::VideoMode OS_X11::get_video_mode(int p_screen) const {
	return current_videomode;
}

void OS_X11::get_fullscreen_mode_list(List<VideoMode> *p_list,int p_screen) const {
}

void OS_X11::set_wm_fullscreen(bool p_enabled) {
	// Using EWMH -- Extened Window Manager Hints
	XEvent xev;
	Atom wm_state = XInternAtom(x11_display, "_NET_WM_STATE", False);
	Atom wm_fullscreen = XInternAtom(x11_display, "_NET_WM_STATE_FULLSCREEN", False);

	memset(&xev, 0, sizeof(xev));
	xev.type = ClientMessage;
	xev.xclient.window = x11_window;
	xev.xclient.message_type = wm_state;
	xev.xclient.format = 32;
	xev.xclient.data.l[0] = p_enabled ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
	xev.xclient.data.l[1] = wm_fullscreen;
	xev.xclient.data.l[2] = 0;

	XSendEvent(x11_display, DefaultRootWindow(x11_display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);

}

int OS_X11::get_screen_count() const {
	// Using Xinerama Extension
	int event_base, error_base;
	const Bool ext_okay = XineramaQueryExtension(x11_display, &event_base, &error_base);
	if( !ext_okay ) return 0;

	int count;
	XineramaScreenInfo* xsi = XineramaQueryScreens(x11_display, &count);
	XFree(xsi);
	return count;
}

int OS_X11::get_current_screen() const {
        int x,y;
        Window child;
        XTranslateCoordinates( x11_display, x11_window, DefaultRootWindow(x11_display), 0, 0, &x, &y, &child);

	int count = get_screen_count();
	for(int i=0; i<count; i++) {
		Point2i pos = get_screen_position(i);
		Size2i size = get_screen_size(i);
		if( (x >= pos.x && x <pos.x + size.width) && (y >= pos.y && y < pos.y + size.height) )
			return i;
	}
	return 0;
}

void OS_X11::set_current_screen(int p_screen) {
	int count = get_screen_count();
	if(p_screen >= count) return;

	if( current_videomode.fullscreen ) {
		Point2i position = get_screen_position(p_screen);
		Size2i size = get_screen_size(p_screen);

	        XMoveResizeWindow(x11_display, x11_window, position.x, position.y, size.x, size.y);
	}
	else {
		if( p_screen != get_current_screen() ) {
			Point2i position = get_screen_position(p_screen);
			XMoveWindow(x11_display, x11_window, position.x, position.y);
		}
	}
}

Point2 OS_X11::get_screen_position(int p_screen) const {
	// Using Xinerama Extension
	int event_base, error_base;
	const Bool ext_okay = XineramaQueryExtension(x11_display, &event_base, &error_base);
	if( !ext_okay ) {
		return Point2i(0,0);
	}

	int count;
	XineramaScreenInfo* xsi = XineramaQueryScreens(x11_display, &count);
	if( p_screen >= count ) {
		return Point2i(0,0);
	}

	Point2i position = Point2i(xsi[p_screen].x_org, xsi[p_screen].y_org);

	XFree(xsi);

	return position;
}

Size2 OS_X11::get_screen_size(int p_screen) const {
	// Using Xinerama Extension
	int event_base, error_base;
	const Bool ext_okay = XineramaQueryExtension(x11_display, &event_base, &error_base);
	if( !ext_okay ) return Size2i(0,0);

	int count;
	XineramaScreenInfo* xsi = XineramaQueryScreens(x11_display, &count);
	if( p_screen >= count ) return Size2i(0,0);

	Size2i size = Point2i(xsi[p_screen].width, xsi[p_screen].height);
	XFree(xsi);
	return size;
}

int OS_X11::get_screen_dpi(int p_screen) const {

	//invalid screen?
	ERR_FAIL_INDEX_V(p_screen, get_screen_count(), 0);

	//Get physical monitor Dimensions through XRandR and calculate dpi
	Size2 sc = get_screen_size(p_screen);
	if (xrandr_ext_ok) {
		int count = 0;
		if (xrr_get_monitors) {
			xrr_monitor_info *monitors = xrr_get_monitors(x11_display, x11_window, true, &count);
			if (p_screen < count) {
				double xdpi = sc.width  / (double) monitors[p_screen].mwidth  * 25.4;
				double ydpi = sc.height / (double) monitors[p_screen].mheight * 25.4;
				xrr_free_monitors(monitors);
				return (xdpi + ydpi) / 2;
			}
			xrr_free_monitors(monitors);
		}
		else if (p_screen == 0) {
			XRRScreenSize *sizes = XRRSizes(x11_display, 0, &count);
			if (sizes) {
				double xdpi = sc.width  / (double) sizes[0].mwidth  * 25.4;
				double ydpi = sc.height / (double) sizes[0].mheight * 25.4;
				return (xdpi + ydpi) / 2;
			}
		}
	}

	int width_mm  = DisplayWidthMM(x11_display, p_screen);
	int height_mm = DisplayHeightMM(x11_display, p_screen);
	double xdpi = (width_mm  ? sc.width  / (double) width_mm  * 25.4 : 0);
	double ydpi = (height_mm ? sc.height / (double) height_mm * 25.4 : 0);
	if (xdpi || xdpi)
		return  (xdpi + ydpi)/(xdpi && ydpi ? 2 : 1);

	//could not get dpi
	return 96;
}

Point2 OS_X11::get_window_position() const {
	int x,y;
	Window child;
	XTranslateCoordinates( x11_display, x11_window, DefaultRootWindow(x11_display), 0, 0, &x, &y, &child);

	int screen = get_current_screen();
	Point2i screen_position = get_screen_position(screen);

	return Point2i(x-screen_position.x, y-screen_position.y);
}

void OS_X11::set_window_position(const Point2& p_position) {
	XMoveWindow(x11_display,x11_window,p_position.x,p_position.y);
}

Size2 OS_X11::get_window_size() const {
	XWindowAttributes xwa;
	XGetWindowAttributes(x11_display, x11_window, &xwa);
	return Size2i(xwa.width, xwa.height);
}

void OS_X11::set_window_size(const Size2 p_size) {
	XResizeWindow(x11_display, x11_window, p_size.x, p_size.y);
}

void OS_X11::set_window_fullscreen(bool p_enabled) {
	set_wm_fullscreen(p_enabled);
	current_videomode.fullscreen = p_enabled;
}

bool OS_X11::is_window_fullscreen() const {
	return current_videomode.fullscreen;
}

void OS_X11::set_window_resizable(bool p_enabled) {
	XSizeHints *xsh;
	xsh = XAllocSizeHints();
	xsh->flags = p_enabled ? 0L : PMinSize | PMaxSize;
	if(!p_enabled) {
		XWindowAttributes xwa;
		XGetWindowAttributes(x11_display,x11_window,&xwa);
		xsh->min_width = xwa.width;
		xsh->max_width = xwa.width;
		xsh->min_height = xwa.height;
		xsh->max_height = xwa.height;
	}
	XSetWMNormalHints(x11_display, x11_window, xsh);
	XFree(xsh);
	current_videomode.resizable = p_enabled;
}

bool OS_X11::is_window_resizable() const {
	return current_videomode.resizable;
}

void OS_X11::set_window_minimized(bool p_enabled) {
	// Using ICCCM -- Inter-Client Communication Conventions Manual
	XEvent xev;
	Atom wm_change = XInternAtom(x11_display, "WM_CHANGE_STATE", False);

	memset(&xev, 0, sizeof(xev));
	xev.type = ClientMessage;
	xev.xclient.window = x11_window;
	xev.xclient.message_type = wm_change;
	xev.xclient.format = 32;
	xev.xclient.data.l[0] = p_enabled ? WM_IconicState : WM_NormalState;

	XSendEvent(x11_display, DefaultRootWindow(x11_display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);

	Atom wm_state     =  XInternAtom(x11_display, "_NET_WM_STATE", False);
	Atom wm_hidden    =  XInternAtom(x11_display, "_NET_WM_STATE_HIDDEN", False);

	memset(&xev, 0, sizeof(xev));
	xev.type = ClientMessage;
	xev.xclient.window = x11_window;
	xev.xclient.message_type = wm_state;
	xev.xclient.format = 32;
	xev.xclient.data.l[0] = _NET_WM_STATE_ADD;
	xev.xclient.data.l[1] = wm_hidden;

	XSendEvent(x11_display, DefaultRootWindow(x11_display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);
}

bool OS_X11::is_window_minimized() const {
	// Using ICCCM -- Inter-Client Communication Conventions Manual
        Atom property = XInternAtom(x11_display,"WM_STATE", True);
        Atom type;
        int format;
        unsigned long len;
        unsigned long remaining;
        unsigned char *data = NULL;

        int result = XGetWindowProperty(
                x11_display,
                x11_window,
                property,
                0,
                32,
                False,
                AnyPropertyType,
                &type,
                &format,
                &len,
                &remaining,
                &data
        );

	if( result == Success ) {
		long *state = (long *) data;
		if( state[0] == WM_IconicState )
			return true;
	}
	return false;
}

void OS_X11::set_window_maximized(bool p_enabled) {
	// Using EWMH -- Extended Window Manager Hints
	XEvent xev;
	Atom wm_state = XInternAtom(x11_display, "_NET_WM_STATE", False);
	Atom wm_max_horz = XInternAtom(x11_display, "_NET_WM_STATE_MAXIMIZED_HORZ", False);
	Atom wm_max_vert = XInternAtom(x11_display, "_NET_WM_STATE_MAXIMIZED_VERT", False);

	memset(&xev, 0, sizeof(xev));
	xev.type = ClientMessage;
	xev.xclient.window = x11_window;
	xev.xclient.message_type = wm_state;
	xev.xclient.format = 32;
	xev.xclient.data.l[0] = p_enabled ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
	xev.xclient.data.l[1] = wm_max_horz;
	xev.xclient.data.l[2] = wm_max_vert;

	XSendEvent(x11_display, DefaultRootWindow(x11_display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);

	maximized = p_enabled;
}

bool OS_X11::is_window_maximized() const {
	// Using EWMH -- Extended Window Manager Hints
	Atom property = XInternAtom(x11_display,"_NET_WM_STATE",False );
	Atom type;
	int format;
	unsigned long len;
	unsigned long remaining;
	unsigned char *data = NULL;

	int result = XGetWindowProperty(
			x11_display,
			x11_window,
			property,
			0,
			1024,
			False,
			XA_ATOM,
			&type,
			&format,
			&len,
			&remaining,
			&data
	);

	if(result == Success) {
		Atom *atoms = (Atom*) data;
		Atom wm_max_horz = XInternAtom(x11_display, "_NET_WM_STATE_MAXIMIZED_HORZ", False);
		Atom wm_max_vert = XInternAtom(x11_display, "_NET_WM_STATE_MAXIMIZED_VERT", False);
		bool found_wm_max_horz = false;
		bool found_wm_max_vert = false;

		for( unsigned int i=0; i < len; i++ ) {
			if( atoms[i] == wm_max_horz )
				found_wm_max_horz = true;
			if( atoms[i] == wm_max_vert )
				found_wm_max_vert = true;

			if( found_wm_max_horz && found_wm_max_vert )
				return true;
		}
		XFree(atoms);
	}

	return false;
}

void OS_X11::request_attention() {
	// Using EWMH -- Extended Window Manager Hints
	//
	// Sets the _NET_WM_STATE_DEMANDS_ATTENTION atom for WM_STATE
	// Will be unset by the window manager after user react on the request for attention
	//
	XEvent xev;
	Atom wm_state = XInternAtom(x11_display, "_NET_WM_STATE", False);
	Atom wm_attention = XInternAtom(x11_display, "_NET_WM_STATE_DEMANDS_ATTENTION", False);

	memset(&xev, 0, sizeof(xev));
	xev.type = ClientMessage;
	xev.xclient.window = x11_window;
	xev.xclient.message_type = wm_state;
	xev.xclient.format = 32;
	xev.xclient.data.l[0] = _NET_WM_STATE_ADD;
	xev.xclient.data.l[1] = wm_attention;

	XSendEvent(x11_display, DefaultRootWindow(x11_display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);
}

InputModifierState OS_X11::get_key_modifier_state(unsigned int p_x11_state) {

	InputModifierState state;

	state.shift = (p_x11_state&ShiftMask);
	state.control = (p_x11_state&ControlMask);
	state.alt = (p_x11_state&Mod1Mask /*|| p_x11_state&Mod5Mask*/); //altgr should not count as alt
	state.meta = (p_x11_state&Mod4Mask);

	return state;
}

unsigned int OS_X11::get_mouse_button_state(unsigned int p_x11_state) {

	unsigned int state=0;

	if (p_x11_state&Button1Mask) {

		state|=1<<0;
	}

	if (p_x11_state&Button3Mask) {

		state|=1<<1;
	}

	if (p_x11_state&Button2Mask) {

		state|=1<<2;
	}

	if (p_x11_state&Button4Mask) {

		state|=1<<3;
	}

	if (p_x11_state&Button5Mask) {

		state|=1<<4;
	}

	last_button_state=state;
	return state;
}

void OS_X11::handle_key_event(XKeyEvent *p_event, bool p_echo) {

	// X11 functions don't know what const is
	XKeyEvent *xkeyevent = p_event;

	// This code was pretty difficult to write.
	// The docs stink and every toolkit seems to
	// do it in a different way.

	/* Phase 1, obtain a proper keysym */

	// This was also very difficult to figure out.
	// You'd expect you could just use Keysym provided by
	// XKeycodeToKeysym to obtain internationalized
	// input.. WRONG!!
	// you must use XLookupString (???) which not only wastes
	// cycles generating an unnecesary string, but also
	// still works in half the cases. (won't handle deadkeys)
	// For more complex input methods (deadkeys and more advanced)
	// you have to use XmbLookupString (??).
	// So.. then you have to chosse which of both results
	// you want to keep.
	// This is a real bizarreness and cpu waster.

	KeySym keysym_keycode=0; // keysym used to find a keycode
	KeySym keysym_unicode=0; // keysym used to find unicode

	// XLookupString returns keysyms usable as nice scancodes/
	char str[256+1];
	XLookupString(xkeyevent, str, 256, &keysym_keycode, NULL);

 	// Meanwhile, XLookupString returns keysyms useful for unicode.


	if (!xmbstring) {
		// keep a temporary buffer for the string
		xmbstring=(char*)memalloc(sizeof(char)*8);
		xmblen=8;
	}

	if (xkeyevent->type == KeyPress && xic) {

		Status status;
		do {

			int mnbytes = XmbLookupString (xic, xkeyevent, xmbstring, xmblen - 1, &keysym_unicode, &status);
			xmbstring[mnbytes] = '\0';

			if (status == XBufferOverflow) {
				xmblen = mnbytes + 1;
				xmbstring = (char*)memrealloc (xmbstring, xmblen);
			}
		} while (status == XBufferOverflow);
	}


	/* Phase 2, obtain a pigui keycode from the keysym */

	// KeyMappingX11 just translated the X11 keysym to a PIGUI
	// keysym, so it works in all platforms the same.

	unsigned int keycode = KeyMappingX11::get_keycode(keysym_keycode);

	/* Phase 3, obtain an unicode character from the keysym */

	// KeyMappingX11 also translates keysym to unicode.
	// It does a binary search on a table to translate
	// most properly.
	//print_line("keysym_unicode: "+rtos(keysym_unicode));
	unsigned int unicode = keysym_unicode>0? KeyMappingX11::get_unicode_from_keysym(keysym_unicode):0;


	/* Phase 4, determine if event must be filtered */

	// This seems to be a side-effect of using XIM.
	// XEventFilter looks like a core X11 funciton,
	// but it's actually just used to see if we must
	// ignore a deadkey, or events XIM determines
	// must not reach the actual gui.
	// Guess it was a design problem of the extension

	bool keypress = xkeyevent->type == KeyPress;

	if (xkeyevent->type == KeyPress && xic) {
                if (XFilterEvent((XEvent*)xkeyevent, x11_window))
                	return;
	}

	if (keycode==0 && unicode==0)
		return;

	/* Phase 5, determine modifier mask */

	// No problems here, except I had no way to
	// know Mod1 was ALT and Mod4 was META (applekey/winkey)
	// just tried Mods until i found them.

	//print_line("mod1: "+itos(xkeyevent->state&Mod1Mask)+" mod 5: "+itos(xkeyevent->state&Mod5Mask));

	InputModifierState state = get_key_modifier_state(xkeyevent->state);

	/* Phase 6, determine echo character */

	// Echo characters in X11 are a keyrelease and a keypress
	// one after the other with the (almot) same timestamp.
	// To detect them, i use XPeekEvent and check that their
	// difference in time is below a treshold.


	if (xkeyevent->type != KeyPress) {

		// make sure there are events pending,
		// so this call won't block.
		if (XPending(x11_display)>0) {
			XEvent peek_event;
			XPeekEvent(x11_display, &peek_event);

			// I'm using a treshold of 5 msecs,
			// since sometimes there seems to be a little
			// jitter. I'm still not convinced that all this approach
			// is correct, but the xorg developers are
			// not very helpful today.

			::Time tresh=ABS(peek_event.xkey.time-xkeyevent->time);
			if (peek_event.type == KeyPress && tresh<5 ) {
				KeySym rk;
				XLookupString((XKeyEvent*)&peek_event, str, 256, &rk, NULL);
				if (rk==keysym_keycode) {
					XEvent event;
					XNextEvent(x11_display, &event); //erase next event
					handle_key_event( (XKeyEvent*)&event,true );
					return; //ignore current, echo next
				}
			}

			// use the time from peek_event so it always works
		}

		// save the time to check for echo when keypress happens
	}


	/* Phase 7, send event to Window */

	InputEvent event;
	event.ID=++event_id;
	event.type = InputEvent::KEY;
	event.device=0;
	event.key.mod=state;
	event.key.pressed=keypress;

	if (keycode>='a' && keycode<='z')
		keycode-='a'-'A';

	event.key.scancode=keycode;
	event.key.unicode=unicode;
	event.key.echo=p_echo;

	if (event.key.scancode==KEY_BACKTAB) {
		//make it consistent accross platforms.
		event.key.scancode=KEY_TAB;
		event.key.mod.shift=true;
	}

	//don't set mod state if modifier keys are released by themselves
	//else event.is_action() will not work correctly here
	if (!event.key.pressed) {
		if (event.key.scancode == KEY_SHIFT)
			event.key.mod.shift = false;
		else if (event.key.scancode == KEY_CONTROL)
			event.key.mod.control = false;
		else if (event.key.scancode == KEY_ALT)
			event.key.mod.alt = false;
		else if (event.key.scancode == KEY_META)
			event.key.mod.meta = false;
	}

	//printf("key: %x\n",event.key.scancode);
	input->parse_input_event( event);
}

struct Property
{
	unsigned char *data;
	int format, nitems;
	Atom type;
};

static Property read_property(Display* p_display, Window p_window, Atom p_property) {

	Atom actual_type;
	int actual_format;
	unsigned long nitems;
	unsigned long bytes_after;
	unsigned char *ret=0;

	int read_bytes = 1024;

	//Keep trying to read the property until there are no
	//bytes unread.
	do
	{
		if(ret != 0)
			XFree(ret);

		XGetWindowProperty(p_display, p_window, p_property, 0, read_bytes, False, AnyPropertyType,
					   &actual_type, &actual_format, &nitems, &bytes_after,
					   &ret);

		read_bytes *= 2;

	}while(bytes_after != 0);

	Property p = {ret, actual_format, nitems, actual_type};

	return p;
}

static Atom pick_target_from_list(Display* p_display, Atom *p_list, int p_count) {

	static const char* target_type = "text/uri-list";

	for (int i = 0; i < p_count; i++) {

		Atom atom = p_list[i];

		if (atom != None && String(XGetAtomName(p_display, atom)) == target_type)
				return atom;
	}
	return None;
}

static Atom pick_target_from_atoms(Display* p_disp, Atom p_t1, Atom p_t2, Atom p_t3) {

	static const char* target_type = "text/uri-list";
	if (p_t1 != None && String(XGetAtomName(p_disp, p_t1)) == target_type)
		return p_t1;

	if (p_t2 != None && String(XGetAtomName(p_disp, p_t2)) == target_type)
		return p_t2;

	if (p_t3 != None && String(XGetAtomName(p_disp, p_t3)) == target_type)
		return p_t3;

	return None;
}

void OS_X11::process_xevents() {

	//printf("checking events %i\n", XPending(x11_display));

	do_mouse_warp=false;

	while (XPending(x11_display) > 0) {
		XEvent event;
		XNextEvent(x11_display, &event);

		switch (event.type) {
		case Expose:
			Main::force_redraw();
			break;

		case NoExpose:
			minimized = true;
			break;

		case VisibilityNotify: {
			XVisibilityEvent * visibility = (XVisibilityEvent *)&event;
			minimized = (visibility->state == VisibilityFullyObscured);
		} break;
		case LeaveNotify: {

			if (main_loop && mouse_mode!=MOUSE_MODE_CAPTURED)
				main_loop->notification(MainLoop::NOTIFICATION_WM_MOUSE_EXIT);
			if (input)
				input->set_mouse_in_window(false);

		} break;
		case EnterNotify: {

			if (main_loop && mouse_mode!=MOUSE_MODE_CAPTURED)
				main_loop->notification(MainLoop::NOTIFICATION_WM_MOUSE_ENTER);
			if (input)
				input->set_mouse_in_window(true);
		} break;
		case FocusIn:
			minimized = false;
			main_loop->notification(MainLoop::NOTIFICATION_WM_FOCUS_IN);
			if (mouse_mode==MOUSE_MODE_CAPTURED) {
				XGrabPointer(x11_display, x11_window, True,
						    ButtonPressMask | ButtonReleaseMask |
						    PointerMotionMask, GrabModeAsync, GrabModeAsync,
						    x11_window, None, CurrentTime);
			}
			break;

		case FocusOut:
			main_loop->notification(MainLoop::NOTIFICATION_WM_FOCUS_OUT);
			if (mouse_mode==MOUSE_MODE_CAPTURED) {
				//dear X11, I try, I really try, but you never work, you do whathever you want.
				XUngrabPointer(x11_display, CurrentTime);
			}
			break;

		case ConfigureNotify:
		/* call resizeGLScene only if our window-size changed */

			if ((event.xconfigure.width == current_videomode.width) &&
			(event.xconfigure.height == current_videomode.height))
				break;

			current_videomode.width=event.xconfigure.width;
			current_videomode.height=event.xconfigure.height;
			break;
		case ButtonPress:
		case ButtonRelease: {

			/* exit in case of a mouse button press */
			last_timestamp=event.xbutton.time;
			if (mouse_mode==MOUSE_MODE_CAPTURED) {
				event.xbutton.x=last_mouse_pos.x;
				event.xbutton.y=last_mouse_pos.y;
			}

			InputEvent mouse_event;
			mouse_event.ID=++event_id;
			mouse_event.type = InputEvent::MOUSE_BUTTON;
			mouse_event.device=0;
			mouse_event.mouse_button.mod = get_key_modifier_state(event.xbutton.state);
			mouse_event.mouse_button.button_mask = get_mouse_button_state(event.xbutton.state);
			mouse_event.mouse_button.x=event.xbutton.x;
			mouse_event.mouse_button.y=event.xbutton.y;
			mouse_event.mouse_button.global_x=event.xbutton.x;
			mouse_event.mouse_button.global_y=event.xbutton.y;
			mouse_event.mouse_button.button_index=event.xbutton.button;
			if (mouse_event.mouse_button.button_index==2)
				mouse_event.mouse_button.button_index=3;
			else if (mouse_event.mouse_button.button_index==3)
				mouse_event.mouse_button.button_index=2;

			mouse_event.mouse_button.pressed=(event.type==ButtonPress);


			if (event.type==ButtonPress && event.xbutton.button==1) {

				uint64_t diff = get_ticks_usec()/1000 - last_click_ms;

				if (diff<400 && Point2(last_click_pos).distance_to(Point2(event.xbutton.x,event.xbutton.y))<5) {

					last_click_ms=0;
					last_click_pos = Point2(-100,-100);
					mouse_event.mouse_button.doubleclick=true;
					mouse_event.ID=++event_id;

				} else {
					last_click_ms+=diff;
					last_click_pos = Point2(event.xbutton.x,event.xbutton.y);
				}
			}

			input->parse_input_event( mouse_event);


		} break;
		case MotionNotify: {

			// FUCK YOU X11 API YOU SERIOUSLY GROSS ME OUT
			// YOU ARE AS GROSS AS LOOKING AT A PUTRID PILE
			// OF POOP STICKING OUT OF A CLOGGED TOILET
			// HOW THE FUCK I AM SUPPOSED TO KNOW WHICH ONE
			// OF THE MOTION NOTIFY EVENTS IS THE ONE GENERATED
			// BY WARPING THE MOUSE POINTER?
			// YOU ARE FORCING ME TO FILTER ONE BY ONE TO FIND IT
			// PLEASE DO ME A FAVOR AND DIE DROWNED IN A FECAL
			// MOUNTAIN BECAUSE THAT'S WHERE YOU BELONG.


			while(true) {
				if (mouse_mode==MOUSE_MODE_CAPTURED && event.xmotion.x==current_videomode.width/2 && event.xmotion.y==current_videomode.height/2) {
					//this is likely the warp event since it was warped here
					center=Vector2(event.xmotion.x,event.xmotion.y);
					break;
				}

				if (XPending(x11_display) > 0) {
					XEvent tevent;
					XPeekEvent(x11_display, &tevent);
					if (tevent.type==MotionNotify) {
						XNextEvent(x11_display,&event);
					} else {
						break;
					}
				} else {
					break;
				}
			}

			last_timestamp=event.xmotion.time;

			// Motion is also simple.
			// A little hack is in order
			// to be able to send relative motion events.
			Point2i pos( event.xmotion.x, event.xmotion.y );

			if (mouse_mode==MOUSE_MODE_CAPTURED) {
#if 1
				//Vector2 c = Point2i(current_videomode.width/2,current_videomode.height/2);
				if (pos==Point2i(current_videomode.width/2,current_videomode.height/2)) {
					//this sucks, it's a hack, etc and is a little inaccurate, etc.
					//but nothing I can do, X11 sucks.

					center=pos;
					break;
				}

				Point2i new_center = pos;
				pos = last_mouse_pos + ( pos - center );
				center=new_center;
				do_mouse_warp=true;
#else
				//Dear X11, thanks for making my life miserable

				center.x = current_videomode.width/2;
				center.y = current_videomode.height/2;
				pos = last_mouse_pos + ( pos-center );
				if (pos==last_mouse_pos)
					break;
				XWarpPointer(x11_display, None, x11_window,
					      0,0,0,0, (int)center.x, (int)center.y);
#endif
			}

			if (!last_mouse_pos_valid) {

				last_mouse_pos=pos;
				last_mouse_pos_valid=true;
			}

			Point2i rel = pos - last_mouse_pos;

			InputEvent motion_event;
			motion_event.ID=++event_id;
			motion_event.type=InputEvent::MOUSE_MOTION;
			motion_event.device=0;

			motion_event.mouse_motion.mod = get_key_modifier_state(event.xmotion.state);
			motion_event.mouse_motion.button_mask = get_mouse_button_state(event.xmotion.state);
			motion_event.mouse_motion.x=pos.x;
			motion_event.mouse_motion.y=pos.y;
			input->set_mouse_pos(pos);
			motion_event.mouse_motion.global_x=pos.x;
			motion_event.mouse_motion.global_y=pos.y;
			motion_event.mouse_motion.speed_x=input->get_mouse_speed().x;
			motion_event.mouse_motion.speed_y=input->get_mouse_speed().y;

			motion_event.mouse_motion.relative_x=rel.x;
			motion_event.mouse_motion.relative_y=rel.y;

			last_mouse_pos=pos;

			// printf("rel: %d,%d\n", rel.x, rel.y );

			input->parse_input_event( motion_event);

		} break;
		case KeyPress:
		case KeyRelease: {

			last_timestamp=event.xkey.time;

			// key event is a little complex, so
			// it will be handled in it's own function.
			handle_key_event( (XKeyEvent*)&event );
		} break;
		case SelectionRequest: {

			XSelectionRequestEvent *req;
			XEvent e, respond;
			e = event;

			req=&(e.xselectionrequest);
			if (req->target == XA_STRING || req->target == XInternAtom(x11_display, "COMPOUND_TEXT", 0) ||
				req->target == XInternAtom(x11_display, "UTF8_STRING", 0))
			{
				CharString clip = OS::get_clipboard().utf8();
				XChangeProperty (x11_display,
					req->requestor,
					req->property,
					req->target,
					8,
					PropModeReplace,
					(unsigned char*)clip.get_data(),
					clip.length());
				respond.xselection.property=req->property;
			} else if (req->target == XInternAtom(x11_display, "TARGETS", 0)) {

				Atom data[2];
				data[0] = XInternAtom(x11_display, "UTF8_STRING", 0);
				data[1] = XA_STRING;
				XChangeProperty (x11_display, req->requestor, req->property, req->target,
						 8, PropModeReplace, (unsigned char *) &data,
						 sizeof (data));
				respond.xselection.property=req->property;

			} else {
				printf ("No String %x\n",
					(int)req->target);
				respond.xselection.property= None;
			}
			respond.xselection.type= SelectionNotify;
			respond.xselection.display= req->display;
			respond.xselection.requestor= req->requestor;
			respond.xselection.selection=req->selection;
			respond.xselection.target= req->target;
			respond.xselection.time = req->time;
			XSendEvent (x11_display, req->requestor,0,0,&respond);
			XFlush (x11_display);
		} break;

		case SelectionNotify:

			if (event.xselection.target == requested) {

				Property p = read_property(x11_display, x11_window, XInternAtom(x11_display, "PRIMARY", 0));

				Vector<String> files = String((char *)p.data).split("\n", false);
				for (int i = 0; i < files.size(); i++) {
					files[i] = files[i].replace("file://", "").replace("%20", " ").strip_escapes();
				}
				main_loop->drop_files(files);

				//Reply that all is well.
				XClientMessageEvent m;
				memset(&m, 0, sizeof(m));
				m.type = ClientMessage;
				m.display = x11_display;
				m.window = xdnd_source_window;
				m.message_type = xdnd_finished;
				m.format=32;
				m.data.l[0] = x11_window;
				m.data.l[1] = 1;
				m.data.l[2] = xdnd_action_copy; //We only ever copy.

				XSendEvent(x11_display, xdnd_source_window, False, NoEventMask, (XEvent*)&m);
			}
			break;

		case ClientMessage:

			if ((unsigned int)event.xclient.data.l[0]==(unsigned int)wm_delete)
				main_loop->notification(MainLoop::NOTIFICATION_WM_QUIT_REQUEST);

			else if ((unsigned int)event.xclient.message_type == (unsigned int)xdnd_enter) {

				//File(s) have been dragged over the window, check for supported target (text/uri-list)
				xdnd_version = ( event.xclient.data.l[1] >> 24);
				Window source = event.xclient.data.l[0];
				bool more_than_3 = event.xclient.data.l[1] & 1;
				if (more_than_3) {
					Property p = read_property(x11_display, source, XInternAtom(x11_display, "XdndTypeList", False));
					requested = pick_target_from_list(x11_display, (Atom*)p.data, p.nitems);
				}
				else
					requested = pick_target_from_atoms(x11_display, event.xclient.data.l[2],event.xclient.data.l[3], event.xclient.data.l[4]);
			}
			else if ((unsigned int)event.xclient.message_type == (unsigned int )xdnd_position) {

				//xdnd position event, reply with an XDND status message
				//just depending on type of data for now
				XClientMessageEvent m;
				memset(&m, 0, sizeof(m));
				m.type = ClientMessage;
				m.display = event.xclient.display;
				m.window = event.xclient.data.l[0];
				m.message_type = xdnd_status;
				m.format=32;
				m.data.l[0] = x11_window;
				m.data.l[1] = (requested != None);
				m.data.l[2] = 0; //empty rectangle
				m.data.l[3] = 0;
				m.data.l[4] = xdnd_action_copy;

				XSendEvent(x11_display, event.xclient.data.l[0], False, NoEventMask, (XEvent*)&m);
				XFlush(x11_display);
			}
			else if ((unsigned int)event.xclient.message_type == (unsigned int)xdnd_drop) {

				if (requested != None) {
					xdnd_source_window = event.xclient.data.l[0];
					if(xdnd_version >= 1)
						XConvertSelection(x11_display, xdnd_selection, requested, XInternAtom(x11_display, "PRIMARY", 0), x11_window, event.xclient.data.l[2]);
					else
						XConvertSelection(x11_display, xdnd_selection, requested, XInternAtom(x11_display, "PRIMARY", 0), x11_window, CurrentTime);
				}
				else {
					//Reply that we're not interested.
					XClientMessageEvent m;
					memset(&m, 0, sizeof(m));
					m.type = ClientMessage;
					m.display = event.xclient.display;
					m.window = event.xclient.data.l[0];
					m.message_type = xdnd_finished;
					m.format=32;
					m.data.l[0] = x11_window;
					m.data.l[1] = 0;
					m.data.l[2] = None; //Failed.
					XSendEvent(x11_display, event.xclient.data.l[0], False, NoEventMask, (XEvent*)&m);
				}
			}
			break;
		default:
			break;
		}
	}

	XFlush(x11_display);

	if (do_mouse_warp) {

		XWarpPointer(x11_display, None, x11_window,
		 	      0,0,0,0, (int)current_videomode.width/2, (int)current_videomode.height/2);

		/*
		Window root, child;
		int root_x, root_y;
		int win_x, win_y;
		unsigned int mask;
		XQueryPointer( x11_display, x11_window, &root, &child, &root_x, &root_y, &win_x, &win_y, &mask );

		printf("Root: %d,%d\n", root_x, root_y);
		printf("Win: %d,%d\n", win_x, win_y);
		*/
	}
}

MainLoop *OS_X11::get_main_loop() const {

	return main_loop;
}

void OS_X11::delete_main_loop() {

	if (main_loop)
		memdelete(main_loop);
	main_loop=NULL;
}

void OS_X11::set_main_loop( MainLoop * p_main_loop ) {

	main_loop=p_main_loop;
	input->set_main_loop(p_main_loop);
}

bool OS_X11::can_draw() const {

	return !minimized;
};

void OS_X11::set_clipboard(const String& p_text) {

	OS::set_clipboard(p_text);

	XSetSelectionOwner(x11_display, XA_PRIMARY, x11_window, CurrentTime);
	XSetSelectionOwner(x11_display, XInternAtom(x11_display, "CLIPBOARD", 0), x11_window, CurrentTime);
};

static String _get_clipboard(Atom p_source, Window x11_window, ::Display* x11_display, String p_internal_clipboard) {

	String ret;

	Atom type;
	Atom selection = XA_PRIMARY;
	int format, result;
	unsigned long len, bytes_left, dummy;
	unsigned char *data;
	Window Sown = XGetSelectionOwner (x11_display, p_source);

	if (Sown == x11_window) {

		return p_internal_clipboard;
	};

	if (Sown != None) {
		XConvertSelection (x11_display, p_source, XA_STRING, selection,
					 x11_window, CurrentTime);
		XFlush (x11_display);
		while (true) {
			XEvent event;
			XNextEvent(x11_display, &event);
			if (event.type == SelectionNotify && event.xselection.requestor == x11_window) {
				break;
			};
		};

		//
		// Do not get any data, see how much data is there
		//
		XGetWindowProperty (x11_display, x11_window,
			selection, 	  // Tricky..
			0, 0,	  	  // offset - len
			0, 	 	  // Delete 0==FALSE
			AnyPropertyType,  //flag
			&type,		  // return type
			&format,	  // return format
			&len, &bytes_left,  //that
			&data);
		// DATA is There
		if (bytes_left > 0)
		{
			result = XGetWindowProperty (x11_display, x11_window,
				selection, 0,bytes_left,0,
				AnyPropertyType, &type,&format,
				&len, &dummy, &data);
			if (result == Success) {
				ret.parse_utf8((const char*)data);
			} else printf ("FAIL\n");
			XFree (data);
		}
	}

	return ret;

}

String OS_X11::get_clipboard() const {

	String ret;
	ret = _get_clipboard(XInternAtom(x11_display, "CLIPBOARD", 0), x11_window, x11_display, OS::get_clipboard());

	if (ret == "") {
		ret = _get_clipboard(XA_PRIMARY, x11_window, x11_display, OS::get_clipboard());
	};

	return ret;
}

String OS_X11::get_name() {

	return "X11";
}

Error OS_X11::shell_open(String p_uri) {

	Error ok;
	List<String> args;
	args.push_back(p_uri);
	ok = execute("/usr/bin/xdg-open",args,false);
	if (ok==OK)
		return OK;
	ok = execute("gnome-open",args,false);
	if (ok==OK)
		return OK;
	ok = execute("kde-open",args,false);
	return ok;
}

String OS_X11::get_system_dir(SystemDir p_dir) const {


	String xdgparam;

	switch(p_dir) {
		case SYSTEM_DIR_DESKTOP: {

			xdgparam="DESKTOP";
		} break;
		case SYSTEM_DIR_DCIM: {

			xdgparam="PICTURES";

		} break;
		case SYSTEM_DIR_DOCUMENTS: {

			xdgparam="DOCUMENTS";

		} break;
		case SYSTEM_DIR_DOWNLOADS: {

			xdgparam="DOWNLOAD";

		} break;
		case SYSTEM_DIR_MOVIES: {

			xdgparam="VIDEOS";

		} break;
		case SYSTEM_DIR_MUSIC: {

			xdgparam="MUSIC";

		} break;
		case SYSTEM_DIR_PICTURES: {

			xdgparam="PICTURES";

		} break;
		case SYSTEM_DIR_RINGTONES: {

			xdgparam="MUSIC";

		} break;
	}

	String pipe;
	List<String> arg;
	arg.push_back(xdgparam);
	Error err = const_cast<OS_X11*>(this)->execute("/usr/bin/xdg-user-dir",arg,true,NULL,&pipe);
	if (err!=OK)
		return ".";
	return pipe.strip_edges();
}

void OS_X11::move_window_to_foreground() {

	XRaiseWindow(x11_display,x11_window);
}

void OS_X11::set_cursor_shape(CursorShape p_shape) {

	ERR_FAIL_INDEX(p_shape,CURSOR_MAX);

	if (p_shape==current_cursor)
		return;
	if (mouse_mode==MOUSE_MODE_VISIBLE) {
		if (cursors[p_shape]!=None)
			XDefineCursor(x11_display,x11_window,cursors[p_shape]);
		else if (cursors[CURSOR_ARROW]!=None)
			XDefineCursor(x11_display,x11_window,cursors[CURSOR_ARROW]);
	}

	current_cursor=p_shape;
}


void OS_X11::release_rendering_thread() {

	context_gl->release_current();

}

void OS_X11::make_rendering_thread() {

	context_gl->make_current();
}

void OS_X11::swap_buffers() {

	context_gl->swap_buffers();
}

void OS_X11::alert(const String& p_alert,const String& p_title) {

	List<String> args;
	args.push_back("-center");
	args.push_back("-title");
	args.push_back(p_title);
	args.push_back(p_alert);

	execute("/usr/bin/xmessage",args,true);
}

void OS_X11::set_icon(const Image& p_icon) {
	Atom net_wm_icon = XInternAtom(x11_display, "_NET_WM_ICON", False);

	if (!p_icon.empty()) {
		Image img=p_icon;
		img.convert(Image::FORMAT_RGBA8);

		int w = img.get_width();
		int h = img.get_height();

		// We're using long to have wordsize (32Bit build -> 32 Bits, 64 Bit build -> 64 Bits
		Vector<long> pd;

		pd.resize(2+w*h);

		pd[0]=w;
		pd[1]=h;

		PoolVector<uint8_t>::Read r = img.get_data().read();

		long * wr = &pd[2];
		uint8_t const * pr = r.ptr();

		for(int i=0;i<w*h;i++) {
			long v=0;
			//    A             R             G            B
			v|=pr[3] << 24 | pr[0] << 16 | pr[1] << 8 | pr[2];
			*wr++=v;
			pr += 4;
		}
		XChangeProperty(x11_display, x11_window, net_wm_icon, XA_CARDINAL, 32, PropModeReplace, (unsigned char*) pd.ptr(), pd.size());
	} else {
	    XDeleteProperty(x11_display, x11_window, net_wm_icon);
	}
	XFlush(x11_display);
}


void OS_X11::run() {

	force_quit = false;

	if (!main_loop)
		return;

	main_loop->init();

//	uint64_t last_ticks=get_ticks_usec();

//	int frames=0;
//	uint64_t frame=0;

	while (!force_quit) {

		process_xevents(); // get rid of pending events
#ifdef JOYDEV_ENABLED
		event_id = joypad->process_joypads(event_id);
#endif
		if (Main::iteration()==true)
			break;
	};

	main_loop->finish();
}

bool OS_X11::is_joy_known(int p_device) {
	return input->is_joy_mapped(p_device);
}

String OS_X11::get_joy_guid(int p_device) const {
	return input->get_joy_guid_remapped(p_device);
}

void OS_X11::set_use_vsync(bool p_enable) {
	if (context_gl)
		return context_gl->set_use_vsync(p_enable);
}

bool OS_X11::is_vsync_enabled() const {

	if (context_gl)
		return context_gl->is_using_vsync();

	return true;
}


void OS_X11::set_context(int p_context) {

	XClassHint* classHint = NULL;
	classHint = XAllocClassHint();
	if (classHint) {

		if (p_context == CONTEXT_EDITOR)
			classHint->res_name = (char *)"Godot_Editor";
		if (p_context == CONTEXT_PROJECTMAN)
			classHint->res_name = (char *)"Godot_ProjectList";
		classHint->res_class = (char *)"Godot";
		XSetClassHint(x11_display, x11_window, classHint);
		XFree(classHint);
	}
}

OS_X11::OS_X11() {

#ifdef RTAUDIO_ENABLED
	AudioDriverManagerSW::add_driver(&driver_rtaudio);
#endif

#ifdef PULSEAUDIO_ENABLED
	AudioDriverManagerSW::add_driver(&driver_pulseaudio);
#endif

#ifdef ALSA_ENABLED
	AudioDriverManagerSW::add_driver(&driver_alsa);
#endif

	if(AudioDriverManagerSW::get_driver_count() == 0){
		WARN_PRINT("No sound driver found... Defaulting to dummy driver");
		AudioDriverManagerSW::add_driver(&driver_dummy);
	}

	minimized = false;
	xim_style=0L;
	mouse_mode=MOUSE_MODE_VISIBLE;
}
